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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ea9624e6ed3f770308786b8440e148e1f3a6b9f86d13070d1041980e4d4b961' 
  AND token = 'iJH5ZeDjqQ1GGVvOgbqZEbRY5bg80ZTcZpwZItekPMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}